| Issue |
EPL
Volume 78, Number 3, May 2007
|
|
|---|---|---|
| Article Number | 30004 | |
| Number of page(s) | 6 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/78/30004 | |
| Published online | 27 April 2007 | |
Sub shot-noise interferometric phase sensitivity with beryllium ions Schrödinger cat states
CNR-INFM BEC Center and Dipartimento di Fisica - Università di Trento, I-38050 Povo, Italy
Received:
20
November
2006
Accepted:
19
March
2007
Interferometry with NOON quantum states can provide unbiased phase estimation with a sensitivity scaling as 
given a prior knowledge that the true phase shift 
lies in the interval 
. The protocol requires a total of 
particles (unequally) distributed among p independent measurements and overcomes basic difficulties present in previously proposed approaches. We demonstrate the possibility to obtain a phase sensitivity beating the classical shot-noise limit using published probabilities retrieved experimentally for the creation of Schrödinger cat quantum states containing up to 
beryllium ions.
PACS: 03.75.Dg – Atom and neutron interferometry / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 42.50.-p – Quantum optics
© Europhysics Letters Association, 2007
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